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|
pub(crate) trait Convert<To> {
fn convert(self) -> To;
}
macro_rules! convert {
($a:ty, $b:ty) => {
impl Convert<$b> for $a {
#[inline(always)]
fn convert(self) -> $b {
unsafe {
let mut result: $b = core::mem::zeroed();
core::ptr::copy_nonoverlapping(
&self as *const $a as *const u8,
&mut result as *mut $b as *mut u8,
core::mem::size_of::<$b>(),
);
return result;
}
}
}
impl Convert<$a> for $b {
#[inline(always)]
fn convert(self) -> $a {
unsafe {
let mut result: $a = core::mem::zeroed();
core::ptr::copy_nonoverlapping(
&self as *const $b as *const u8,
&mut result as *mut $a as *mut u8,
core::mem::size_of::<$a>(),
);
return result;
}
}
}
};
}
convert!([u128; 4], [u64; 8]);
convert!([u128; 4], [u32; 16]);
convert!([u128; 4], [u16; 32]);
convert!([u128; 4], [u8; 64]);
convert!([u128; 2], [u64; 4]);
convert!([u128; 2], [u32; 8]);
convert!([u128; 2], [u16; 16]);
convert!([u128; 2], [u8; 32]);
convert!(u128, [u64; 2]);
convert!(u128, [u32; 4]);
convert!(u128, [u16; 8]);
convert!(u128, [u8; 16]);
convert!([u64; 8], [u32; 16]);
convert!([u64; 8], [u16; 32]);
convert!([u64; 8], [u8; 64]);
convert!([u64; 4], [u32; 8]);
convert!([u64; 4], [u16; 16]);
convert!([u64; 4], [u8; 32]);
convert!([u64; 2], [u32; 4]);
convert!([u64; 2], [u16; 8]);
convert!([u64; 2], [u8; 16]);
convert!([u32; 4], [u16; 8]);
convert!([u32; 4], [u8; 16]);
convert!([u16; 8], [u8; 16]);
convert!(u64, [u32; 2]);
convert!(u64, [u16; 4]);
convert!(u64, [u8; 8]);
convert!([u32; 2], [u16; 4]);
convert!([u32; 2], [u8; 8]);
convert!(u32, [u16; 2]);
convert!(u32, [u8; 4]);
convert!([u16; 2], [u8; 4]);
convert!(u16, [u8; 2]);
convert!([[u64; 4]; 2], [u8; 64]);
convert!([f64; 2], [u8; 16]);
convert!([f32; 4], [u8; 16]);
convert!(f64, [u8; 8]);
convert!([f32; 2], [u8; 8]);
convert!(f32, [u8; 4]);
macro_rules! as_array {
($input:expr, $len:expr) => {{
{
#[inline(always)]
fn as_array<T>(slice: &[T]) -> &[T; $len] {
assert_eq!(slice.len(), $len);
unsafe { &*(slice.as_ptr() as *const [_; $len]) }
}
as_array($input)
}
}};
}
pub(crate) trait ReadFromSlice {
fn read_u16(&self) -> (u16, &[u8]);
fn read_u32(&self) -> (u32, &[u8]);
fn read_u64(&self) -> (u64, &[u8]);
fn read_u128(&self) -> (u128, &[u8]);
fn read_u128x2(&self) -> ([u128; 2], &[u8]);
fn read_u128x4(&self) -> ([u128; 4], &[u8]);
fn read_last_u16(&self) -> u16;
fn read_last_u32(&self) -> u32;
fn read_last_u64(&self) -> u64;
fn read_last_u128(&self) -> u128;
fn read_last_u128x2(&self) -> [u128; 2];
fn read_last_u128x4(&self) -> [u128; 4];
}
impl ReadFromSlice for [u8] {
#[inline(always)]
fn read_u16(&self) -> (u16, &[u8]) {
let (value, rest) = self.split_at(2);
(as_array!(value, 2).convert(), rest)
}
#[inline(always)]
fn read_u32(&self) -> (u32, &[u8]) {
let (value, rest) = self.split_at(4);
(as_array!(value, 4).convert(), rest)
}
#[inline(always)]
fn read_u64(&self) -> (u64, &[u8]) {
let (value, rest) = self.split_at(8);
(as_array!(value, 8).convert(), rest)
}
#[inline(always)]
fn read_u128(&self) -> (u128, &[u8]) {
let (value, rest) = self.split_at(16);
(as_array!(value, 16).convert(), rest)
}
#[inline(always)]
fn read_u128x2(&self) -> ([u128; 2], &[u8]) {
let (value, rest) = self.split_at(32);
(as_array!(value, 32).convert(), rest)
}
#[inline(always)]
fn read_u128x4(&self) -> ([u128; 4], &[u8]) {
let (value, rest) = self.split_at(64);
(as_array!(value, 64).convert(), rest)
}
#[inline(always)]
fn read_last_u16(&self) -> u16 {
let (_, value) = self.split_at(self.len() - 2);
as_array!(value, 2).convert()
}
#[inline(always)]
fn read_last_u32(&self) -> u32 {
let (_, value) = self.split_at(self.len() - 4);
as_array!(value, 4).convert()
}
#[inline(always)]
fn read_last_u64(&self) -> u64 {
let (_, value) = self.split_at(self.len() - 8);
as_array!(value, 8).convert()
}
#[inline(always)]
fn read_last_u128(&self) -> u128 {
let (_, value) = self.split_at(self.len() - 16);
as_array!(value, 16).convert()
}
#[inline(always)]
fn read_last_u128x2(&self) -> [u128; 2] {
let (_, value) = self.split_at(self.len() - 32);
as_array!(value, 32).convert()
}
#[inline(always)]
fn read_last_u128x4(&self) -> [u128; 4] {
let (_, value) = self.split_at(self.len() - 64);
as_array!(value, 64).convert()
}
}
|
